Source code for manim.animation.numbers
"""Animations for changing numbers."""
from __future__ import annotations
__all__ = ["ChangingDecimal", "ChangeDecimalToValue"]
import typing
from manim.mobject.text.numbers import DecimalNumber
from ..animation.animation import Animation
from ..utils.bezier import interpolate
[docs]class ChangingDecimal(Animation):
def __init__(
self,
decimal_mob: DecimalNumber,
number_update_func: typing.Callable[[float], float],
suspend_mobject_updating: bool | None = False,
**kwargs,
) -> None:
self.check_validity_of_input(decimal_mob)
self.number_update_func = number_update_func
super().__init__(
decimal_mob, suspend_mobject_updating=suspend_mobject_updating, **kwargs
)
def check_validity_of_input(self, decimal_mob: DecimalNumber) -> None:
if not isinstance(decimal_mob, DecimalNumber):
raise TypeError("ChangingDecimal can only take in a DecimalNumber")
[docs] def interpolate_mobject(self, alpha: float) -> None:
self.mobject.set_value(self.number_update_func(self.rate_func(alpha)))
[docs]class ChangeDecimalToValue(ChangingDecimal):
def __init__(
self, decimal_mob: DecimalNumber, target_number: int, **kwargs
) -> None:
start_number = decimal_mob.number
super().__init__(
decimal_mob, lambda a: interpolate(start_number, target_number, a), **kwargs
)